Accepting CTRL-C as input
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
|
show 1 more comment
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
Dec 16 at 19:14
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
Dec 16 at 19:15
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25
|
show 1 more comment
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have one problem in a Linux script.
#!/bin/bash
x=1;
while [ $x != 0 ]
do
echo "Type a command:"
read -r command
eval "$command"
if [ "$command" = end ]
then x=0;
fi
if [ "$command" = kill ]
then echo "To end the program, type the end"
fi
done
And I want to make the same thing with CTRL_C like for kill. When a user types CTRL_C, script will display: To end the program, type the end. But I don't know how to do that.
An assignment is :
Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
shell-script scripting
shell-script scripting
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
edited Dec 16 at 23:22
Rui F Ribeiro
38.8k1479128
38.8k1479128
asked Dec 16 at 19:01
Miggu
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 16 at 19:01
Miggu
133
asked Dec 16 at 19:01
Miggu
133
133
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Miggu is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
Dec 16 at 19:14
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
Dec 16 at 19:15
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25
|
show 1 more comment
Ctrl+C can be handled in atrapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.
– Mark Plotnick
Dec 16 at 19:14
Ignoring your question for the moment, should't theeval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.
– nohillside
Dec 16 at 19:15
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25
Ctrl+C can be handled in a
trap statement, or you can arrange things so that the Ctrl-C is read as a character by the read. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
Dec 16 at 19:14
Ctrl+C can be handled in a
trap statement, or you can arrange things so that the Ctrl-C is read as a character by the read. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
Dec 16 at 19:14
Ignoring your question for the moment, should't the
eval $command part be after the two ifs? You may also want to take a look at case in the Compound Commands section of the man page for bash.– nohillside
Dec 16 at 19:15
Ignoring your question for the moment, should't the
eval $command part be after the two ifs? You may also want to take a look at case in the Compound Commands section of the man page for bash.– nohillside
Dec 16 at 19:15
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25
|
show 1 more comment
1 Answer
1
active
oldest
votes
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered Dec 16 at 19:38
V13
2,789613
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f489360%2faccepting-ctrl-c-as-input%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered Dec 16 at 19:38
V13
2,789613
add a comment |
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered Dec 16 at 19:38
V13
2,789613
add a comment |
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered Dec 16 at 19:38
V13
2,789613
Ctrl-C is "special" when you have terminal emulation because it is caught and results in a signal (SIGINT) to be sent to your script. You have two options:
- You can make your script catch SIGINT and handle it as you wish. This is done with
trap xxx SIGINTwhere xxx is a bash function to execute - You can make the terminal ignore ctrl-c by running
stty intr undef. You'll most probably have some issues catching ctrl-c though.
answered Dec 16 at 19:38
V13
2,789613
answered Dec 16 at 19:38
V13
2,789613
answered Dec 16 at 19:38
V13
2,789613
answered Dec 16 at 19:38
V13
2,789613
2,789613
add a comment |
add a comment |
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Miggu is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f489360%2faccepting-ctrl-c-as-input%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Ctrl+C can be handled in a
trapstatement, or you can arrange things so that the Ctrl-C is read as a character by theread. Which would you prefer? If this is an assignment , please give us all the details.– Mark Plotnick
Dec 16 at 19:14
Ignoring your question for the moment, should't the
eval $commandpart be after the twoifs? You may also want to take a look atcasein the Compound Commands section of the man page forbash.– nohillside
Dec 16 at 19:15
@MarkPlotnick An assignment is : Write a script working in a loop, displaying the "Enter command:" message and retrieving a string from the keyboard. If the user types "end", the script should end. In all other cases, he should treat the entered string as a command that should be executed by the shell. If during the work the key <ctrl-c> was pressed or an attempt was made to kill the script with the kill command, the script should display the following information: To finish the work write "end"
– Miggu
Dec 16 at 19:19
@nohillside Sure, I will consider that.
– Miggu
Dec 16 at 19:21
Could you please edit your question to include the text of the assignment from that comment? I think it would make it easier for people to answer.
– Mark Plotnick
Dec 16 at 19:25